Finance Receivables And Loans, Net (Past Due Financing Receivables And Loans) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 1,111	$ 1,227
60 - 89 days past due	243	286
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	255	323
Total past due	1,609	1,836
Current	99,168	98,491
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	100,777	100,327
Finance receivables and loans, net	100,778	100,328	96,993
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,036	1,145
60 - 89 days past due	215	255
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	130	157
Total past due	1,381	1,557
Current	56,733	54,860
Finance receivables and loans, net	58,114	56,417
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	75	82
60 - 89 days past due	28	31
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	112	124
Total past due	215	237
Current	7,631	8,206
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	7,846	8,443
Finance receivables and loans, net	7,847	8,444
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13	42
Total past due	13	42
Current	34,804	35,425
Finance receivables and loans, net	34,817	35,467
Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	12	36
Total past due	12	36
Current	30,039	30,912
Finance receivables and loans, net	30,051	30,948
Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total past due	0	0
Current	1,776	1,664
Finance receivables and loans, net	1,776	1,664
Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1	6
Total past due	1	6
Current	2,989	2,849
Finance receivables and loans, net	$ 2,990	$ 2,855